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Q&A #19694


Proof for multiplication rule

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From: ---
To: Teacher2Teacher Service
Date: Jul 17, 2008 at 04:20:30
Subject: Proof for multiplication rule 

Is there any proof for multiplication table?

+ * + = +

- * - = +

+ * - = -

- * + = -

Also please let us know whether any interesting story related to this?

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